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Variations of Isoflavone Contents in Seeds and Sprouts of Sprout Soybean Cultivars  

Kim, Young-Jin (Honam Agricultural Research Institute, NICS, RDA)
Oh, Young-Jin (Honam Agricultural Research Institute, NICS, RDA)
Cho, Sang-Kyun (Honam Agricultural Research Institute, NICS, RDA)
Kim, Jung-Gon (Honam Agricultural Research Institute, NICS, RDA)
Park, Myoung-Ryoul (Division of Biological Resources Sciences and Institute of Agricultural Science and Technology, Chonbuk Nat'l Univ.)
Yun, Song-Joong (Division of Biological Resources Sciences and Institute of Agricultural Science and Technology, Chonbuk Nat'l Univ.)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.51, no.spc1, 2006 , pp. 160-165 More about this Journal
Abstract
Biofuctionality of soybean seeds and soy-bean products have been fortified by the uncovering of the multifuctional beneficial effects of isoflavones. As one way to fully utilize beneficial effects of isoflavones in soybean sprout is through the enhancement of isoflavone contents in soybean seeds, genetic selection for higher isoflavone and cultivational measures to increase isoflavone content in soybean seeds were attempted. Isoflavones (daidzein, gemstein) contents in soybean seeds and soybean sprouts were determined by high performance liquid chromatography. Total isoflavone contents in soybean seeds ranged from 756 to $1,682{\mu}g/g$ and Iksan #13 $(1,682{\mu}g/g)$ showed highest content among the 21 germplasms analyzed. Onetime treatment of soybean plants with Antipol or Piaster at the $V_4$ stage yielded seeds with higher isoflavones as $2,472{\mu}g/g\;or\;2,052{\mu}g/g$, respectively, which were higher by 37% and 14% than that of seeds in the control plants, respectively. In Eunhakong, Isoflavone contents of soybean sprout changed during sprouting. Daidzein content in hypocotyl increased to maximum on the third day of cultivation and decreased there-after, whereas the content changed little in cotyledon. In sprouts of Pungsannamulkong, daidzein content in hypocotyl showed a maximum level on the first day and decreased gradually thereafter but, the content changed little in cotyledon. Total isoflavone contents in lateral roots which developed on the 6th day after sprouting ranged from 4,416 to $5,232{\mu}g/g$ DW.
Keywords
HPLC; isoflavones; plant growth regulators; soybean; sprout;
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